Superman's Lex Luthor star Nicholas Hoult joins HBO's Harry Potter ahead of season 2, but he's not playing Voldemort

The first season of HBO's Harry Potter TV show hasn't even hit screens yet, but the second season is already adding new cast members fast, with the latest addition being Superman star Nicholas Hoult. However, despite many fans believing that Hoult would suit up as the Dark Lord himself, Voldemort, D…